void gtk_icon_source_set_state_wildcarded ( GtkIconSource* source, gboolean setting )
If the widget state is wildcarded, this source can be used as the
base image for an icon in any
GtkStateType. If the widget state
is not wildcarded, then the state the source applies to should be
gtk_icon_source_set_state() and the icon source will
only be used with that specific state.
GtkIconSet prefers non-wildcarded sources (exact matches) over
wildcarded sources, and will use an exact match when possible.
GtkIconSet will normally transform wildcarded source images to
produce an appropriate icon for a given state, for example
lightening an image on prelight, but will not modify source images
that match exactly.